Measurement of Lambda(c) branching fractions of Cabibbo-suppressed decay modes in the BABAR experiment

This dissertation reports on a study of the relative branching fraction measurement of the charmed baryon Λc decaying to the Cabibbo-suppressed modes.; A data sample of 125 fb-1 is used for these measurements. This data samples was collected with the BABAR detector at the Upsilon(4 S) resonance and ∼40 MeV below the resonance. The branching fractions measurement of the Cabibbo-suppressed decays L+c → Λ0 K+ and L+c → Sigma0 K+ relative to that of Cabibbo-favored modes L+c → Λ0 pi+ and L+c → Sigma0 pi+ to be 0.044 +/- 0.004 (stat.) +/- 0.003 (syst.) and 0.038 +/- 0.005 (stat.) +/- 0.003 (syst.), respectively, are presented. This analysis also set an upper limit on the branching fraction at 90% confidence level for L+c → Λ0 K+pi +pi- to be <4.8 x 10-2 relative to that of L+c → Λ0 pi+. The upper limit of the branching fraction into the decay L+c → Sigma0 K+pi +pi- relative to that of L+c → Sigma0 pi+ has been measured to be <2.0 x 10-2 at the 90% confidence level. We also measure the relative branching fraction for the Cabibbo-favored modes L+c → Sigma0 pi+, L+c → xi- K+ pi + and L+c → Λ0 K0S K+ relative to that of L+c → Λ0pi+ to be: 0.977 +/- 0.015 (stat.) +/- 0.051 (syst.), 0.481 +/- 0.016 (stat.) +/- 0.038 (syst.) and 0.397 +/- 0.026 (stat.) +/- 0.036 (syst.), respectively. Comparison to previous experiments and also to the theoretical predictions (wherever needed) are also given.